Provided are a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT), with a transmission and receipt processing method and device for time-frequency synchronization between V2X terminals. When a synchronization signal to be transmitted is identical to a synchronization signal of an existing D2D terminal, time-frequency resources configured for the D2D terminal in a cell are reused to transmit the synchronization signal. When synchronization signal to be transmitted is different from a synchronization signal of an existing D2D terminal, reconfigured time-frequency resources are used to transmit the synchronization signal. The synchronization signal transmitted by a V2X terminal indicates a corresponding synchronization source type by using a value of an SLSS sequence index and/or a value of a PSBCH specified field.
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1. A method performed by a terminal for vehicle to everything (V2X) communication in a wireless communication system, the method comprising: identifying configuration information for the V2X communication including synchronization priority information set to a global navigation satellite system (GNSS) or a base station, the synchronization priority information indicating whether the terminal prioritizes the base station over the GNSS; receiving a plurality of synchronization signals; and selecting a synchronization reference from the plurality of synchronization signals, based on the synchronization priority information, wherein, in case that the synchronization priority information is set to the base station, the base station is prioritized over the GNSS and a priority order of selecting a synchronization reference is as follows, at least one first terminal transmitting at least one first synchronization has a first priority; a GNSS signal has a second priority; and at least one second terminal transmitting at least one second synchronization signal has a third priority, and wherein the at least one first terminal has selected the base station as the synchronization reference, and the at least one second terminal has selected the GNSS as the synchronization reference.
This invention relates to vehicle-to-everything (V2X) communication in wireless systems, addressing synchronization challenges where terminals must select a reliable synchronization reference from multiple sources, such as base stations, global navigation satellite systems (GNSS), or other terminals. The problem arises when conflicting synchronization signals are received, potentially causing communication disruptions or inefficiencies. The method involves a terminal identifying configuration information for V2X communication, which includes synchronization priority settings indicating whether the terminal prioritizes a base station or GNSS. The terminal then receives multiple synchronization signals and selects a synchronization reference based on the priority settings. If the priority is set to the base station, the terminal follows a defined hierarchy: terminals that have already synchronized with the base station are given the highest priority, followed by GNSS signals, and then terminals that have synchronized with GNSS. This ensures that the most reliable and consistent synchronization source is chosen, improving communication stability and efficiency in V2X networks. The approach helps mitigate synchronization conflicts by establishing a clear decision-making process for terminals in dynamic wireless environments.
2. The method of claim 1 , wherein a priority of a first terminal in coverage is higher than a priority of a first terminal out of coverage.
Wireless communication systems manage device access based on priority to ensure critical services function reliably. A method assigns higher priority to terminals within network coverage compared to those outside coverage. This ensures that in-network devices, which may have more urgent or stable communication needs, receive preferential access to network resources. The method may involve evaluating signal strength, network registration status, or other indicators to determine coverage status. By prioritizing in-coverage terminals, the system optimizes resource allocation, reduces congestion, and maintains service quality for essential communications. This approach is particularly useful in scenarios where network capacity is limited, such as during emergencies or in densely populated areas. The method may also integrate with other priority schemes, such as emergency service prioritization or quality-of-service (QoS) policies, to further refine access control. The system dynamically adjusts priorities based on real-time conditions, ensuring efficient and fair resource distribution. This solution addresses challenges in network management, such as balancing access fairness and service reliability, while supporting seamless communication for critical applications.
3. The method of claim 1 , wherein a priority of a second terminal in coverage is higher than a priority of a second terminal out of coverage.
Wireless communication systems manage device connectivity in scenarios where multiple terminals compete for network resources, particularly in environments with limited coverage or high device density. A key challenge is efficiently prioritizing terminals to ensure fair and reliable access while optimizing network performance. Existing solutions often fail to dynamically adjust priorities based on coverage status, leading to inefficiencies in resource allocation. This invention addresses the problem by implementing a priority-based system where terminals within network coverage are assigned higher priority than those outside coverage. The method involves assessing the coverage status of each terminal and dynamically adjusting their priority levels accordingly. Terminals in coverage receive preferential access to network resources, such as bandwidth or scheduling slots, while terminals out of coverage are deprioritized to prevent resource contention. This approach ensures that in-coverage terminals, which are actively engaged with the network, receive stable and uninterrupted service, while out-of-coverage terminals are managed to avoid unnecessary resource consumption. The system may integrate with existing network protocols to monitor coverage status and adjust priorities in real time, enhancing overall network efficiency and user experience. The invention is particularly useful in dense wireless environments, such as urban areas or industrial IoT deployments, where coverage variability is common.
4. The method of claim 1 , wherein the plurality of synchronization signals include at least one of a sidelink synchronization signal (SLSS) and a broadcast signal.
This invention relates to wireless communication systems, specifically methods for synchronizing devices in a sidelink communication network. The problem addressed is the need for reliable synchronization between devices in decentralized networks where traditional infrastructure-based synchronization signals may not be available. The invention provides a method for transmitting synchronization signals between devices to establish and maintain synchronization in such networks. The method involves generating and transmitting a plurality of synchronization signals, which include at least one of a sidelink synchronization signal (SLSS) and a broadcast signal. The SLSS is used to synchronize devices directly communicating over a sidelink, while the broadcast signal may be used to synchronize devices within a broader network area. The synchronization signals are transmitted periodically or triggered by specific events, such as network entry or loss of synchronization. The signals may also include timing information, such as frame timing or subframe timing, to ensure precise synchronization between devices. The method further includes receiving and processing the synchronization signals by other devices in the network. Upon receiving a synchronization signal, a device may adjust its local timing to align with the received signal, ensuring synchronized communication. The method may also involve selecting the best synchronization source from multiple available signals to improve reliability. This selection may be based on signal strength, signal quality, or other criteria. The invention enhances synchronization in decentralized networks, improving communication reliability and efficiency.
5. A terminal or vehicle to everything (V2X) communication in a wireless communication system, the terminal comprising: a transceiver; and at least one processor configured to: identify configuration information for the V2X communication including synchronization priority information set to a global navigation satellite system (GNSS) or a base station, the synchronization priority information indicating whether the terminal prioritizes the base station over the GNSS; control the transceiver to receive a plurality of synchronization signals; and select a synchronization reference from the plurality of synchronization signals, based on the synchronization priority information, wherein, in case that the synchronization priority information is set to the base station, the at least one processor is further configured to prioritize the base station over the GNSS and select the synchronization reference based on a priority order as follows: at least one first terminal transmitting at least one first synchronization has a first priority; a GNSS signal has a second priority; and at least one second terminal transmitting at least one second synchronization signal has a third priority, and wherein the at least one first terminal has selected the base station as the synchronization reference, and the at least one second terminal has selected the GNSS as the synchronization reference.
This invention relates to vehicle-to-everything (V2X) communication in wireless systems, addressing synchronization challenges where terminals must choose between global navigation satellite system (GNSS) and base station synchronization sources. The terminal includes a transceiver and a processor that identifies configuration information specifying synchronization priority, either GNSS or base station. The processor controls the transceiver to receive multiple synchronization signals and selects a synchronization reference based on the priority setting. If the base station is prioritized, the terminal follows a defined order: first priority is given to terminals already synchronized with the base station, second priority to GNSS signals, and third priority to terminals synchronized with GNSS. This ensures reliable synchronization in dynamic V2X environments by dynamically adjusting to the most stable reference source. The system improves synchronization accuracy and reduces conflicts in V2X communications by prioritizing base station-synchronized terminals over GNSS and other terminals, enhancing overall network reliability.
6. The terminal of claim 5 , wherein a priority of a first terminal in coverage is higher than a priority of a first terminal out of coverage.
This invention relates to wireless communication systems, specifically addressing resource allocation and priority management for terminals operating in different coverage states. The problem solved is ensuring efficient and fair resource allocation when some terminals are within network coverage while others are outside, preventing coverage gaps from disrupting service quality. The terminal includes a priority assignment mechanism that differentiates between terminals based on their coverage status. A terminal in coverage (connected to the network) is assigned a higher priority than a terminal out of coverage (disconnected or in a low-signal area). This prioritization ensures that in-coverage terminals receive preferential access to network resources, such as bandwidth or scheduling slots, while out-of-coverage terminals are allocated remaining resources. The system may also include a detection module to monitor coverage status dynamically, adjusting priorities as terminals move in or out of coverage. The invention may further include a resource allocation module that schedules transmissions based on the assigned priorities, ensuring that critical services for in-coverage terminals are maintained while still providing limited access to out-of-coverage terminals. This approach optimizes network efficiency and fairness, particularly in scenarios with mixed coverage conditions.
7. The terminal of claim 5 , wherein a priority of a second terminal in coverage is higher than a priority of a second terminal out of coverage.
This invention relates to wireless communication systems, specifically addressing terminal prioritization in scenarios where multiple terminals compete for network resources. The problem solved is ensuring efficient and fair resource allocation when some terminals are within network coverage while others are not, which can lead to conflicts or suboptimal performance. The invention describes a terminal device configured to prioritize communication with terminals that are within network coverage over those that are out of coverage. This prioritization is based on a dynamic priority assignment mechanism, where terminals in coverage are assigned a higher priority than those out of coverage. The terminal device may include a processor and a memory storing instructions that, when executed, cause the terminal to determine the coverage status of other terminals and adjust communication priorities accordingly. The prioritization may involve scheduling, resource allocation, or data transmission decisions to favor in-coverage terminals, thereby improving overall network efficiency and reliability. The system may also include mechanisms to detect and update coverage status dynamically, ensuring that priority assignments remain accurate as network conditions change. This approach helps maintain stable communication links for terminals within coverage while minimizing disruptions for those temporarily out of coverage.
8. The terminal of claim 5 , wherein the plurality of synchronization signals include at least one of a sidelink synchronization signal (SLSS) and a broadcast signal.
This invention relates to wireless communication terminals, specifically those configured for device-to-device (D2D) or sidelink communication in cellular networks. The problem addressed is the need for reliable synchronization and broadcast signal transmission in decentralized networks where devices communicate directly without relying solely on a central base station. The terminal includes a transceiver for wireless communication and a processor configured to generate and transmit synchronization signals. These signals enable other nearby devices to synchronize their timing and coordinate communication. The synchronization signals include at least one of a sidelink synchronization signal (SLSS) or a broadcast signal. The SLSS is used for time and frequency synchronization between devices, while the broadcast signal carries system information or control data to facilitate D2D communication. The terminal may also receive and process similar signals from other devices to maintain synchronization and network coordination. This allows devices to operate efficiently in scenarios where direct base station coverage is limited or unavailable, such as in public safety networks or vehicle-to-everything (V2X) applications. The invention improves reliability and reduces latency in decentralized wireless communication environments.
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June 1, 2020
March 8, 2022
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